Subject position determination method, program product for determining subject position, and camera
a subject position and program product technology, applied in the field of subject position determination method, can solve problems such as difficulty in determining the accurate subject position based on the af area
Active Publication Date: 2013-11-05
NIKON CORP
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AI Technical Summary
Benefits of technology
The present invention provides a method for accurately positioning an AF frame to a subject in a traditional imaging device. This is difficult to achieve with traditional methods, but the present invention uses a plurality of binarized images generated based on color or brightness information of the target image. The evaluation value used to determine the subject position is calculated for each binarized image, and the subject position is determined based upon the evaluation value. The method also includes noise removal processing and hue classification to improve the accuracy of the subject position determination. The invention provides a computer-readable computer program product and a camera or image processing device that can execute the subject position determination method.
Problems solved by technology
However, it is difficult for the user to accurately position an AF frame to the subject with a traditional imaging device, which may cause a displacement between the AF area selected by the user and the actual subject position, thereby resulting in difficulty in determining the accurate subject position based upon the AF area.
Method used
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Embodiment Construction
[0028]FIG. 1 is a block diagram showing the structure of an embodiment of the camera in the present embodiment. A camera 100 includes an operating member 101, a lens 102, an image sensor 103, a control unit 104, a memory card slot 105, and a monitor 106. The operating member 101 includes a variety of input members to be operated by the user, for instance, a power button, a release button, a zoom button, an arrow key, a decision button, a playback button, a delete button, and the like.
[0029]Although the lens 102 is constituted with a plurality of optical lenses, only one lens is illustrated in FIG. 1 as a representative of them. The image sensor 103 is an image sensor, for example, a CCD image sensor, a CMOS image sensor, or the like, which captures a subject image formed by the lens 102. Then, an image signal obtained by the image-capturing is output to the control unit 104.
[0030]Based upon an image signal input from the image sensor 103, the control unit 104 generates image data (h...
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A subject position determination method includes: generating a plurality of binarized images of a target image based upon color information or brightness information of the target image; calculating an evaluation value used to determine a subject position in the target image for each of the plurality of binarized images; and determining a subject position in the target image based upon the evaluation value.
Description
INCORPORATION BY REFERENCE[0001]The disclosure of the following priority application is herein incorporated by reference: Japanese Patent Application No. 2009-163857 filed Jul. 10, 2009.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a subject position determination method, a program product for determining a subject position, and a camera.[0004]2. Description of Related Art[0005]There is an imaging device known in the related art that performs focusing processing for an AF area selected by the user (Japanese Laid-open Patent Application No. 2004-205885).SUMMARY OF THE INVENTION[0006]However, it is difficult for the user to accurately position an AF frame to the subject with a traditional imaging device, which may cause a displacement between the AF area selected by the user and the actual subject position, thereby resulting in difficulty in determining the accurate subject position based upon the AF area.[0007]According to the 1st as...
Claims
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IPC IPC(8): G06K9/36G06K9/34
CPCG06T7/0042G06T7/408G06T2207/10024G06T2207/20212G06T2207/30196G06T7/73G06T7/90
Inventor ABE
Owner NIKON CORP